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Evaluate $\cos{570^\circ}+\sin{-765^\circ}$
in Grade 12 Maths by Diamond (40.1k points) | 20 views

1 Answer

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Use reduction formula,

= cos(570-360) + sin (-765+360x2)

= cos 210 + sin-45

= cos(180+30) + -sin45

= -cos30 - sin45 , applying special angle values we have,

= - √3/2 - √2/2

= (-√3-√2)/2
by Silver Status (31.3k points)

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